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Abstract

A machine for winding the yoke of a cathode ray tube is designed to form two diametrically opposing, multi-section deflection coils directly on a prefabricated bobbin in a precise manner to minimize raster distortion and defocusing. The figure is a conceptual, isometric view of the winding head. The probe assembly 11, an upper left gripper assembly 13, an upper right gripper assembly 14, a lower left gripper assembly 23, a lower right gripper assembly 25, and a nest assembly 15 movements are controlled digitally from a personal computer via an application program and electro-hydraulic servo loops (not shown). The application program utilizes a table look-up technique to avoid code changes for every new yoke type or motion scaling.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
52% of the total text.

Robot to Wind Stator Yoke

A machine for
winding the yoke of a cathode ray tube is
designed to form two diametrically opposing, multi-section deflection
coils directly on a prefabricated bobbin in a precise manner to
minimize raster distortion and defocusing. The figure is a
conceptual, isometric view of the winding head.
The probe assembly
11, an upper left gripper assembly 13, an upper right gripper
assembly 14, a lower left gripper assembly 23, a lower right gripper
assembly 25, and a nest assembly 15 movements are controlled
digitally from a personal computer via an application program and
electro-hydraulic servo loops (not shown). The application program
utilizes a table look-up technique to avoid code changes for every
new yoke type or motion scaling.

The bobbin
17, shown in the center of the figure, consists of a
ferrite core 10 and two plastic end-caps 21. Usually, the inner
surface of the core 19 is slotted to provide axial channels for the
magnet wire, while the end-caps 21 are formed with symmetrically
distributed hook members and slots. When
assembled, slots 21a of the
end- caps 21 are matched with the axial grooves 19a of the core 19.
In some cases for low cost considerations, the end-caps are extended
into the bore of a smooth ferrite to form wire channels for the
segmented deflection coils.

The
individual subassemblies of the winding head function as
follows: The probe 11 feeds and
transfers magnet wire between the
upper and lower end caps 21 with an axial motion (direction of arrows
20). The upper grippers recapture the
wire after axial transfe...